Figure 1

EELS spectra imaging of the KNN/STO interface (filtered).
(a) HAADF-STEM image of KNN/STO interface with the area from which EELS mapping was carried out (highlighted with a green line rectangle); (b) integrated line profiles of atomic columns across the interface along the out-of-plane direction; (c) and (d) color-coded Nb and Ti elemental maps, respectively; (e) composite elemental map with Nb in red, Ti in green; (f) integrated line profiles of Nb and Ti signals in (c) and (d) across the interface, respectively.